Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 391, Issue 1, Pages L1-L4Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2008.00508.x
Keywords
cosmology: cosmological parameters; gamma-rays: bursts; gamma-rays: observations
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [19540283, 19047004, 19035006, 18684007]
- Grants-in-Aid for Scientific Research [19035006, 18684007, 19540283, 19047003] Funding Source: KAKEN
Ask authors/readers for more resources
We calibrated the peak energy-peak luminosity relation of gamma-ray bursts (GRBs; the so-called Yonetoku relation) using 33 events with redshift z < 1.62 without assuming any cosmological models. The luminosity distances to GRBs are estimated from those of large numbers of Type Ia supernovae with z < 1.755. This calibratedYonetoku relation can be used as a newcosmic distance ladder towards higher redshifts. We determined the luminosity distances of 30 GRBs in 1.8 < z < 5.6 using the calibrated relation, and plotted the likelihood contour in the (Omega(m), Omega(Lambda)) plane. We obtained (Omega(m), Omega(Lambda)) = (0.37(-0.11)(+0.14), 0.63(-0.14)(+0.11)) for a flat universe. Because our method is free from the circularity problem, we can say that our universe in 1.8 < z < 5.6 is compatible with the so-called concordance cosmological model derived for z < 1.8. This suggests that the time variation of the dark energy is small or zero up to z similar to 6.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available